Cuckoo clock information needed

by Jaimi R.
(Yakima, WA, USA)

I recently found two cuckoo clocks at a yard sale. The only things they're missing are the pendulums, and chain weights that I can tell.

The first one is an E.Schmeckenbecher-8 day Regula, the other is a D. Hones Titisee-Neustadt, Regula. This one is missing a chain.

Do these just need the pendulums, and weights to function? I am not savvy at all with clocks and would appreciate your help.

Thank you,
Jaimi